CPUDetect: Ensure we never get zero cores.

Common/CPUDetect.cpp

@@ -26,6 +26,7 @@
 #include <sys/sysctl.h>
 #endif
 
+#include <algorithm>
 #include <cstdint>
 #include <memory.h>
 #include <set>
@@ -369,7 +370,7 @@ void CPUInfo::Detect() {
 	}
 
 	// This seems to be the count per core.  Hopefully all cores are the same, but we counted each above.
-	logical_cpu_count /= num_cores;
+	logical_cpu_count /= std::max(num_cores, 1);
 #elif PPSSPP_PLATFORM(LINUX)
 	if (File::Exists("/sys/devices/system/cpu/present")) {
 		// This may not count unplugged cores, but at least it's a best guess.
@@ -396,7 +397,7 @@ void CPUInfo::Detect() {
 	}
 
 	// This seems to be the count per core.  Hopefully all cores are the same, but we counted each above.
-	std::max(logical_cpu_count /= std::max(num_cores, 1), 1);
+	logical_cpu_count /= std::max(num_cores, 1);
 #elif PPSSPP_PLATFORM(MAC)
 	int num = 0;
 	size_t sz = sizeof(num);
@@ -404,10 +405,12 @@ void CPUInfo::Detect() {
 		num_cores = num;
 		sz = sizeof(num);
 		if (sysctlbyname("hw.logicalcpu_max", &num, &sz, nullptr, 0) == 0) {
-			logical_cpu_count = num / num_cores;
+			logical_cpu_count = num / std::max(num_cores, 1);
 		}
 	}
 #endif
+	if (logical_cpu_count <= 0)
+		logical_cpu_count = 1;
 }
 
 // Turn the cpu info into a string we can show